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Texas Instruments TPS54320, User Manual

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4 Schematic and Bill of Materials

This section presents the TPS54320 schematic and bill of materials.

4.1 Schematic

Figure 4-1

 is the schematic for the TPS54320.

Figure 4-1. TPS54320EVM-513 Schematic

Schematic and Bill of Materials

www.ti.com

14

TPS54320 Step-Down Converter Evaluation Module User's Guide

SLVU380A – SEPTEMBER 2010 – REVISED OCTOBER 2021

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Copyright © 2021 Texas Instruments Incorporated

Summary of Contents for TPS54320

Page 1: ... TPS54320 Line Regulation 6 Figure 2 5 TPS54320 Transient Response 7 Figure 2 6 TPS54320 Loop Response 7 Figure 2 7 TPS54320 Output Ripple 8 Figure 2 8 TPS54320 Input Ripple 8 Figure 2 9 TPS54320 Start Up Relative to VIN 9 Figure 2 10 TPS54320 Start Up Relative to Enable 9 Figure 2 11 TPS54320 Thermal Image 10 Figure 3 1 TPS54320 Top Side Layout 11 Figure 3 2 TPS54320 Bottom Side Layout 12 Figure ...

Page 2: ...le slow start tracking and undervoltage lockout inputs The absolute maximum input voltage is 20 V for the TPS54320 Table 1 1 Input Voltage and Output Current Summary EVM Input Voltage Range Output Current Range TPS54320 VIN 8 V to 17 V VIN start voltage 6 806 V 0 A to 3 A 1 2 Performance Specification Summary A summary of the TPS54320 performance specifications is provided in Table 1 2 Specificati...

Page 3: ...e can be adjusted by changing the value of C7 Use Equation 2 to calculate the required value of C7 for a desired slow start time Tss ms Iss A C7 nF Vref V m 2 The EVM is set for a slow start time of 3 5 msec using C7 0 01 μF 1 3 3 Track In The TPS54320 can track an external voltage during start up The J5 connector is provided to allow connection to that external voltage Ratio metric or simultaneou...

Page 4: ...current capability must be 3 A Wire lengths must be minimized to reduce losses in the wires Test point TP1 provides a place to monitor the VIN input voltages with TP2 providing a convenient ground reference TP8 is used to monitor the output voltage with TP9 as the ground reference Table 2 1 EVM Connectors and Test Points Reference Designator Function J1 PVIN input voltage connector see Table 1 1 f...

Page 5: ...54320 at lower output currents below 0 20 A at an ambient temperature of 25 C 0 20 40 60 80 100 120 140 160 180 200 0 10 20 30 40 50 60 70 80 90 100 Efficiency I Output Current mA O V 17 V I V 8 V I V 15 V I V 10 V I V 12 V I Figure 2 2 TPS54320 Low Current Efficiency The efficiency may be lower at higher ambient temperatures due to temperature variation in the drain to source resistance of the in...

Page 6: ...en for an ambient temperature of 25 C 2 4 Output Voltage Line Regulation Figure 2 4 shows the line regulation for the TPS54320 8 10 12 14 16 V Input Voltage V I 0 05 0 04 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04 0 05 Percent Deviation I 0 A O I 1 5 A O I 3 A O Figure 2 4 TPS54320 Line Regulation Test Setup and Results www ti com 6 TPS54320 Step Down Converter Evaluation Module User s Guide SLVU380A SE...

Page 7: ...ponse 2 6 Loop Characteristics Figure 2 6 shows the TPS54320 loop response characteristics Gain and phase plots are shown for VIN of 12 V Load current for the measurement is 3 A 60 50 40 30 20 10 0 10 20 30 40 50 60 100 1k 10k 100k 1M f Frequency Hz 180 150 120 90 60 30 0 30 60 90 120 150 180 Phase Gain Gain dB Phase deg Figure 2 6 TPS54320 Loop Response www ti com Test Setup and Results SLVU380A ...

Page 8: ... Inductor current 1 A div PH 10 V div Figure 2 7 TPS54320 Output Ripple 2 8 Input Voltage Ripple Figure 2 8 shows the TPS54320 input voltage The output current is the rated full load of 3 A and VIN 12 V The ripple voltage is measured directly across the input capacitors V 200 mV div AC coupled IN Inductor current 1 A div PH 10 V div t Time 1 s div m Figure 2 8 TPS54320 Input Ripple Test Setup and ...

Page 9: ...he enable threshold voltage the start up sequence begins and the output voltage ramps up to the externally set value of 3 3 V The input voltage for these plots is 12 V and the load is 1 1Ω V 10 V div IN EN 2 V div SS TR 1 V div V 2 V div OUT t Time 2 ms div Figure 2 9 TPS54320 Start Up Relative to VIN V 10 V div IN EN 2 V div SS TR 1 V div V 2 V div OUT t Time 2 ms div Figure 2 10 TPS54320 Start U...

Page 10: ...e peak temperature of the IC 59 5 C is well below the maximum recommended operating condition listed in the data sheet of 150 C Figure 2 11 TPS54320 Thermal Image Test Setup and Results www ti com 10 TPS54320 Step Down Converter Evaluation Module User s Guide SLVU380A SEPTEMBER 2010 REVISED OCTOBER 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 11: ...e ground plane to the bottom side ground plane The input decoupling capacitors C2 and C3 and bootstrap capacitor C5 are all located as close to the IC as possible In addition the voltage set point resistor divider components are also kept close to the IC The voltage divider network ties to the output voltage at the point of regulation the copper VOUT trace at the J3 output connector For the TPS543...

Page 12: ...Bottom Side Layout Board Layout www ti com 12 TPS54320 Step Down Converter Evaluation Module User s Guide SLVU380A SEPTEMBER 2010 REVISED OCTOBER 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 13: ... the components used in this design is 0 35 in2 227 mm2 This area does not include test point or connectors www ti com Board Layout SLVU380A SEPTEMBER 2010 REVISED OCTOBER 2021 Submit Document Feedback TPS54320 Step Down Converter Evaluation Module User s Guide 13 Copyright 2021 Texas Instruments Incorporated ...

Page 14: ...ematic Figure 4 1 is the schematic for the TPS54320 Figure 4 1 TPS54320EVM 513 Schematic Schematic and Bill of Materials www ti com 14 TPS54320 Step Down Converter Evaluation Module User s Guide SLVU380A SEPTEMBER 2010 REVISED OCTOBER 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 15: ... R2 R3 100KΩ Resistor Chip 1 16W 1 0603 Std Std 1 R4 1 78KΩ Resistor Chip 1 16W 1 0603 Std Std 1 R7 51 1Ω Resistor Chip 1 16W 1 0603 Std Std 1 R8 31 6KΩ Resistor Chip 1 16W 1 0603 Std Std 1 R9 10 0KΩ Resistor Chip 1 16W 1 0603 Std Std 1 U1 TPS54320RHL IC 17V Input 3A Output Sync Step Down Switcher with Integrated FET QFN14 TPS54320RHL TI 5 Revision History NOTE Page numbers for previous revisions ...

Page 16: ...other than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control techniques are used to the extent TI deems necessary TI does not test all parameters of each EVM User s claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects...

Page 17: ... These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation...

Page 18: ...y for convenience and should be verified by User 1 Use EVMs in a shielded room or any other test facility as defined in the notification 173 issued by Ministry of Internal Affairs and Communications on March 28 2006 based on Sub section 1 1 of Article 6 of the Ministry s Rule for Enforcement of Radio Law of Japan 2 Use EVMs only after User obtains the license of Test Radio Station as provided in R...

Page 19: ... any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees affiliates contractors or designees 4 4 User assumes all...

Page 20: ...OR DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthermore no return of EVM s will be accepted if the package has been opened and no return of the EVM s will be accepted if they are damaged or otherwise not in a resalable condition If User feels it has...

Page 21: ...o change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for and you will fully indemn...

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